CAShapeLayer

CAShapeLayer属于QuartzCore框架,继承与CALayer,所以本质上CAShapeLayer是一个layer,layer有的属性他都有。CAShapeLayer是通过矢量图形而不是bitmap来绘制图层子类,指定诸如颜色和线宽等属性,用CGPath来绘制图形。CAShapeLayer主要作用是根据路径来绘制图形。只要给定一个路径然后他进行绘制,常用来和BezierPath配合使用。

相关属性

CGPathRef path 路径
 CGColorRef fillcolor 填充颜色

 CGColorRef strokeColor 路径颜色
 CGFloat strokeStart 开始值0-1
 CGFloat strokeEnd   结束值0-1
 CGFloat lineWidth   线宽
 CGFloat miterLimit  内角和外角距离
 
 
NSString fillRule 填充规则,默认非零法则,奇偶原则
  `fillRule' values.

CA_EXTERN NSString *const kCAFillRuleNonZero    //非零
CA_EXTERN NSString *const kCAFillRuleEvenOdd    //齐偶

 
 
 
 NSString lineCap。   线端口(开始点和结束点)类型
 
CA_EXTERN NSString *const kCALineCapButt 方形结束, 结束位置正好为精确位置。——默认值
CA_EXTERN NSString *const kCALineCapRound 圆角
CA_EXTERN NSString *const kCALineCapSquare //方形结束, 结束位置超过精确位置半个线宽。
 
 NSString lineJoin    线连接处类型
 
CA_EXTERN NSString *const kCALineJoinMiter 尖角 默认
CA_EXTERN NSString *const kCALineJoinRound 圆角
CA_EXTERN NSString *const kCALineJoinBevel 斜角

 CGFloat。 lineDashPhase 绘制虚线路径 线性模版起始位置
 
 NSArray *lineDashPattern。 线性模版,数组实线和虚线循环 @[@6,@6]该属性默认是实线绘制,如果设置那么就是设置线新大小的值设置越大线体粒子越大,反之越小,前一个值设置线性粒子粗细,后一个值设置间隔粗细

demo
1.和bezierPath配合进行画圆

@property(nonatomic,strong) CAShapeLayer *layer; 绘制
@property(nonatomic,strong) NSTimer *waterTimer; 定时器

- (void)viewDidLoad {
    [super viewDidLoad];

  //圆
    UIBezierPath *bezi = [UIBezierPath bezierPathWithOvalInRect:CGRectMake(50, 50, 100, 100)];
    
    CAShapeLayer *layer = [[CAShapeLayer alloc] init];
    //路径
    layer.path = bezi.CGPath;
    
    //路径颜色
    layer.strokeColor = [UIColor redColor].CGColor;
    //填充色
    layer.fillColor = [UIColor whiteColor].CGColor;
    //线宽
    layer.lineWidth = 15;
    //开始值 先不设置在定时器中设置让他循环填充
    layer.strokeStart = 0;
    //结束值
    layer.strokeEnd = 0;
    //默认不设置是实线绘制,如果设置那么会虚线绘制前一个值是绘制虚线粗细,后一个值间隔粗细
   // layer.lineDashPattern = @[@6,@2];
    [self.showView.layer addSublayer:layer];
    self.layer = layer;
    
    self.waterTimer = [NSTimer scheduledTimerWithTimeInterval:0.1 target:self selector:@selector(waterAction) userInfo:nil repeats:YES];


}

- (void)waterAction{
    if (self.layer.strokeEnd >=1) {
        销毁定时器
        [self.waterTimer invalidate];
        self.waterTimer = nil;
        return;
    }else{
         每次+0.02;
        self.layer.strokeEnd +=0.02;
    }
}

demo2 渐变色圆形进度条
需要用到的知识:mask遮罩+CAGradientLayer渐变+BezierPath+CASapeLayer

@property(nonatomic,strong)UIView *contentMaksView; 遮罩层
@property(nonatomic,strong) CAGradientLayer *gradlayer; 渐变layer
@property(nonatomic,strong) NSTimer *waterTimer; 定时器
@property(nonatomic,strong) CAShapeLayer *shapeLayer; 绘制layer

 //贝塞尔曲线路径画圆
    UIBezierPath *bezi = [UIBezierPath bezierPathWithOvalInRect:CGRectMake(10,10,100,100)];
    //创建绘制对象
    CAShapeLayer *layer = [[CAShapeLayer alloc] init];
    //获取路径
    layer.path = bezi.CGPath;
    
    //路径颜色
    layer.strokeColor = [UIColor redColor].CGColor;
    //填充色
    layer.fillColor = [UIColor whiteColor].CGColor;
    //线宽
    layer.lineWidth = 15;
    //开始值
    layer.strokeStart = 0;
    //结束值
    layer.strokeEnd = 0;
    //默认,不设置是实线绘制,如果设置那么会虚线绘制前一个值是绘制虚线粗细,后一个值间隔粗细
    layer.lineDashPattern = @[@6,@2];
    self.shapeLayer = layer;

 //渐变图层
    _gradlayer = [CAGradientLayer layer];
    
    [ _gradlayer setStartPoint:CGPointMake(0.3, 0.5)];
    
    [ _gradlayer setEndPoint:CGPointMake(1, 1)];
    _gradlayer.frame = CGRectMake(0,0,frame.size.width, frame.size.height);
     _gradlayer.colors=@[(id)[UIColor redColor].CGColor,(id)[UIColor yellowColor].CGColor,(id)[UIColor brownColor].CGColor,(id)[UIColor purpleColor].CGColor];
    [ _gradlayer setLocations:@[@0.2,@0.4,@0.7,@1.0]];

  //渐变图层上添加一个遮挡图层,在渐变图层上显示遮挡图层形状,
    [_gradlayer setMask:_shapeLayer];
    //将渐变图层加入到view的layer上
    [self.layer addSublayer:_gradlayer];


    //遮挡图层
    _contentMaksView = [[UIView alloc]initWithFrame:CGRectMake(9,9,102,102)];
    _contentMaksView.layer.cornerRadius = 50;
     _contentMaksView.layer.masksToBounds = YES;
    _contentMaksView.backgroundColor = [UIColor whiteColor];
  [self addSubview:_contentMaksView];


    //定时器
   self.waterTimer = [NSTimer scheduledTimerWithTimeInterval:0.1 target:self selector:@selector(waterAction) userInfo:nil repeats:YES];


- (void)waterAction{
    if (self.shapeLayer.strokeEnd >=1) {
        [self.waterTimer invalidate];
        self.waterTimer = nil;
        return;
    }else{
        self.shapeLayer.strokeEnd +=0.02;
      
    }
}

效果图
CAShapeLayer_第1张图片

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